| Merthyr Tudful to Peterborough | 144.79 mi (233.02 km) |
| Merthyr Tudful to Peterhead | 403.44 mi (649.28 km) |
| Merthyr Tudful to Peterlee | 224.97 mi (362.05 km) |
| Merthyr Tudful to Petersfield | 116.99 mi (188.28 km) |
| Merthyr Tudful to Pinner | 128.48 mi (206.77 km) |
| Merthyr Tudful to Pitsea | 166.81 mi (268.46 km) |
| Merthyr Tudful to Plumstead | 149.79 mi (241.07 km) |
| Merthyr Tudful to Plymouth | 100.41 mi (161.59 km) |
| Merthyr Tudful to Plympton | 98.21 mi (158.05 km) |
| Merthyr Tudful to Plymstock | 100.64 mi (161.96 km) |
| Merthyr Tudful to Polegate | 168.97 mi (271.93 km) |
| Merthyr Tudful to Ponders End | 142.85 mi (229.89 km) |
| Merthyr Tudful to Pont-y-pwl | 14.69 mi (23.64 km) |
| Merthyr Tudful to Pontardulais | 28.42 mi (45.74 km) |
| Merthyr Tudful to Pontefract | 159.96 mi (257.43 km) |
